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comparison src/vertex.nim @ 17:b40466fa446a

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add: vertex basics, some refactoring
author Sam <sam@basx.dev>
date Sun, 01 Jan 2023 01:00:50 +0700
parents a571db114152
children
comparison
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16:617c6dcddbe2 17:b40466fa446a
1 import std/macros
2 import std/strutils
3 import std/strformat
4 import std/typetraits
5
6 import ./math/vector
7 import ./vulkan
8
1 type 9 type
2 VertexAttribute = object 10 VertexAttributeType = SomeNumber|Vec
11 VertexAttribute*[T:VertexAttributeType] = object
3 12
4 VertexType = object
5 13
14 # from https://registry.khronos.org/vulkan/specs/1.3-extensions/html/chap15.html
15 func nLocationSlots[T: VertexAttributeType](): int =
16 when (T is Vec3[float64] or T is Vec3[uint64] or T is Vec4[float64] or T is Vec4[float64]):
17 2
18 else:
19 1
20
21 # numbers
22 func getVkFormat[T: VertexAttributeType](): VkFormat =
23 when T is uint8: VK_FORMAT_R8_UINT
24 elif T is int8: VK_FORMAT_R8_SINT
25 elif T is uint16: VK_FORMAT_R16_UINT
26 elif T is int16: VK_FORMAT_R16_SINT
27 elif T is uint32: VK_FORMAT_R32_UINT
28 elif T is int32: VK_FORMAT_R32_SINT
29 elif T is uint64: VK_FORMAT_R64_UINT
30 elif T is int64: VK_FORMAT_R64_SINT
31 elif T is float32: VK_FORMAT_R32_SFLOAT
32 elif T is float64: VK_FORMAT_R64_SFLOAT
33 elif T is Vec2[uint8]: VK_FORMAT_R8G8_UINT
34 elif T is Vec2[int8]: VK_FORMAT_R8G8_SINT
35 elif T is Vec2[uint16]: VK_FORMAT_R16G16_UINT
36 elif T is Vec2[int16]: VK_FORMAT_R16G16_SINT
37 elif T is Vec2[uint32]: VK_FORMAT_R32G32_UINT
38 elif T is Vec2[int32]: VK_FORMAT_R32G32_SINT
39 elif T is Vec2[uint64]: VK_FORMAT_R64G64_UINT
40 elif T is Vec2[int64]: VK_FORMAT_R64G64_SINT
41 elif T is Vec2[float32]: VK_FORMAT_R32G32_SFLOAT
42 elif T is Vec2[float64]: VK_FORMAT_R64G64_SFLOAT
43 elif T is Vec3[uint8]: VK_FORMAT_R8G8B8_UINT
44 elif T is Vec3[int8]: VK_FORMAT_R8G8B8_SINT
45 elif T is Vec3[uint16]: VK_FORMAT_R16G16B16_UINT
46 elif T is Vec3[int16]: VK_FORMAT_R16G16B16_SINT
47 elif T is Vec3[uint32]: VK_FORMAT_R32G32B32_UINT
48 elif T is Vec3[int32]: VK_FORMAT_R32G32B32_SINT
49 elif T is Vec3[uint64]: VK_FORMAT_R64G64B64_UINT
50 elif T is Vec3[int64]: VK_FORMAT_R64G64B64_SINT
51 elif T is Vec3[float32]: VK_FORMAT_R32G32B32_SFLOAT
52 elif T is Vec3[float64]: VK_FORMAT_R64G64B64_SFLOAT
53 elif T is Vec4[uint8]: VK_FORMAT_R8G8B8A8_UINT
54 elif T is Vec4[int8]: VK_FORMAT_R8G8B8A8_SINT
55 elif T is Vec4[uint16]: VK_FORMAT_R16G16B16A16_UINT
56 elif T is Vec4[int16]: VK_FORMAT_R16G16B16A16_SINT
57 elif T is Vec4[uint32]: VK_FORMAT_R32G32B32A32_UINT
58 elif T is Vec4[int32]: VK_FORMAT_R32G32B32A32_SINT
59 elif T is Vec4[uint64]: VK_FORMAT_R64G64B64A64_UINT
60 elif T is Vec4[int64]: VK_FORMAT_R64G64B64A64_SINT
61 elif T is Vec4[float32]: VK_FORMAT_R32G32B32A32_SFLOAT
62 elif T is Vec4[float64]: VK_FORMAT_R64G64B64A64_SFLOAT
63
64 func getGLSLType[T: VertexAttributeType](): string =
65 # todo: likely not correct as we would need to enable some
66 # extensions somewhere (Vulkan/GLSL compiler?) to have
67 # everything work as intended. Or maybe the GPU driver does
68 # some automagic conversion stuf..
69 when T is uint8: "uint"
70 elif T is int8: "int"
71 elif T is uint16: "uint"
72 elif T is int16: "int"
73 elif T is uint32: "uint"
74 elif T is int32: "int"
75 elif T is uint64: "uint"
76 elif T is int64: "int"
77 elif T is float32: "float"
78 elif T is float64: "double"
79
80 elif T is Vec2[uint8]: "uvec2"
81 elif T is Vec2[int8]: "ivec2"
82 elif T is Vec2[uint16]: "uvec2"
83 elif T is Vec2[int16]: "ivec2"
84 elif T is Vec2[uint32]: "uvec2"
85 elif T is Vec2[int32]: "ivec2"
86 elif T is Vec2[uint64]: "uvec2"
87 elif T is Vec2[int64]: "ivec2"
88 elif T is Vec2[float32]: "vec2"
89 elif T is Vec2[float64]: "dvec2"
90
91 elif T is Vec3[uint8]: "uvec3"
92 elif T is Vec3[int8]: "ivec3"
93 elif T is Vec3[uint16]: "uvec3"
94 elif T is Vec3[int16]: "ivec3"
95 elif T is Vec3[uint32]: "uvec3"
96 elif T is Vec3[int32]: "ivec3"
97 elif T is Vec3[uint64]: "uvec3"
98 elif T is Vec3[int64]: "ivec3"
99 elif T is Vec3[float32]: "vec3"
100 elif T is Vec3[float64]: "dvec3"
101
102 elif T is Vec4[uint8]: "uvec4"
103 elif T is Vec4[int8]: "ivec4"
104 elif T is Vec4[uint16]: "uvec4"
105 elif T is Vec4[int16]: "ivec4"
106 elif T is Vec4[uint32]: "uvec4"
107 elif T is Vec4[int32]: "ivec4"
108 elif T is Vec4[uint64]: "uvec4"
109 elif T is Vec4[int64]: "ivec4"
110 elif T is Vec4[float32]: "vec4"
111 elif T is Vec4[float64]: "dvec4"
112
113 template rawAttributeType(v: VertexAttribute): auto = get(genericParams(typeof(v)), 0)
114
115 func generateGLSL[T](): string =
116 var stmtList: seq[string]
117 var i = 0
118 for name, value in T().fieldPairs:
119 when typeof(value) is VertexAttribute:
120 let glsltype = getGLSLType[rawAttributeType(value)]()
121 let n = name
122 stmtList.add(&"layout(location = {i}) in {glsltype} {n};")
123 i += nLocationSlots[rawAttributeType(value)]()
124
125 return stmtList.join("\n")
126
127 func generateInputVertexBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputBindingDescription] =
128 # packed attribute data, not interleaved (aks "struct of arrays")
129 var binding = bindingoffset
130 for name, value in T().fieldPairs:
131 when typeof(value) is VertexAttribute:
132 result.add(
133 VkVertexInputBindingDescription(
134 binding: uint32(binding),
135 stride: uint32(sizeof(rawAttributeType(value))),
136 inputRate: VK_VERTEX_INPUT_RATE_VERTEX, # VK_VERTEX_INPUT_RATE_INSTANCE for instances
137 )
138 )
139 binding += 1
140
141 func generateInputAttributeBinding*[T](bindingoffset: int = 0, locationoffset: int = 0): seq[VkVertexInputAttributeDescription] =
142 # packed attribute data, not interleaved (aks "struct of arrays")
143 var location = 0
144 var binding = bindingoffset
145 for name, value in T().fieldPairs:
146 when typeof(value) is VertexAttribute:
147 result.add(
148 VkVertexInputAttributeDescription(
149 binding: uint32(binding),
150 location: uint32(location),
151 format: getVkFormat[rawAttributeType(value)](),
152 offset: 0,
153 )
154 )
155 location += nLocationSlots[rawAttributeType(value)]()
156 binding += 1
157
158 func getBindingDescription(binding: int): auto =
159 VkVertexInputBindingDescription(
160 binding: uint32(binding),
161 stride: 0, # either sizeof of vertex (array of structs) or of attribute (struct of arrays)
162 inputRate: VK_VERTEX_INPUT_RATE_VERTEX, # VK_VERTEX_INPUT_RATE_INSTANCE for instances
163 )
164
165 func getAttributeDescriptions(binding: int): auto =
166 [
167 VkVertexInputAttributeDescription(
168 binding: 0'u32,
169 location: 0,
170 format: VK_FORMAT_R32G32_SFLOAT,
171 offset: 0,
172 ),
173 VkVertexInputAttributeDescription(
174 binding: 0'u32,
175 location: 1,
176 format: VK_FORMAT_R32G32B32_SFLOAT,
177 offset: uint32(sizeof(Vec2)), # use offsetOf?
178 ),
179 ]